Denitration catalyst for increasing specific area and preparation method

A technology of denitrification catalyst and specific surface area, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problem of unbalanced active centers, etc., to achieve improved efficiency, high catalyst performance, and improved The effect of catalyst strength

Inactive Publication Date: 2017-09-29
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a denitrification catalyst with increased specific surface area and its preparation method, so as to overcome the defect that the active center of the denitrification catalyst in the prior art is unbalanced in the high-temperature flue gas, and the catalyst of the present invention can resist flue gas Medium vanadium oxide is deposited unevenly on its surface, which increases the specific surface area of ​​the catalyst and improves the performance of the catalyst

Method used

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  • Denitration catalyst for increasing specific area and preparation method

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Embodiment 1

[0046] Add 15g of coconut shell activated carbon into the glucose solution, mix well and beat to form a slurry (a), which will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For 35g / L solution (b), will contain WO 3 A total of 22.5g of ammonium paratungstate solution was mixed with (a) and (b) materials, and after 2 hours of mechanical stirring, ammonia water was gradually added to adjust the pH value to 9.0. After the precipitation was complete, filter and wash; then the washed materials were prepared with deionized water. into a slurry with a water content of 60%, adding V 2 o 5 A total of 4.5g of ammonium metavanadate solution was stirred mechanically for 1.5h, and after direct drying, it was roasted at 620°C for 4h in a nitrogen atmosphere; after roasting, the powder was mixed with SiO 2 A total of 7.5g of sodium silicate was made into a slurry with a water content of 30%. After stirring, 4g of scallop powder was added, stirre...

Embodiment 2

[0050] Add 20g of wood-based activated carbon into the sucrose solution, mix thoroughly and beat to form a slurry (a), which will contain TiO 2 500g of titanyl sulfate is dissolved in sulfuric acid solution to form TiO 2 For 35g / L solution (b), add (a), (b) containing WO 3 A total of 22.5g of ammonium paratungstate solution, after mechanical stirring for 1.5h, gradually add ammonia water to adjust the pH value to 9.5, after the precipitation is complete, filter and wash; then use deionized water to make a slurry with a water content of 50%, and add with V 2 o 5 A total of 2.5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1.5h. After direct drying, it was roasted at 600°C in a nitrogen atmosphere for 6h; after roasting, the powder was mixed with SiO 2 5g of sodium silicate was prepared into a slurry with a water content of 35%. After stirring, 2.5g of scallop powder was added, stirred for 30 minutes, sealed and left for 15 hours, dried, and...

Embodiment 3

[0054] Add 20g of wood-based activated carbon into the sucrose solution, mix thoroughly and beat to form a slurry (a), which will contain TiO 2 500g of metatitanic acid is dissolved in sulfuric acid solution to form TiO 2 For 35g / L solution (b), add (a), (b) containing WO 3 A total of 20g of ammonium paratungstate solution, after mechanical stirring for 1 hour, gradually add ammonia water to adjust the pH value to 9.5, after the precipitation is complete, filter and wash; then use deionized water to make a slurry with a water content of 45%, and add V 2 o 5 A total of 5g of ammonium metavanadate solution was stirred and ultrasonically oscillated for 1h. After direct drying, it was roasted at 550°C for 6h; after roasting, the powder was mixed with SiO 2 5g of sodium silicate was used to make a slurry with a water content of 30%. After stirring, 3g of urea was added, stirred for 30 minutes, sealed and left for 20 hours, dried, and roasted at 550°C for 5 hours to obtain a denit...

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Abstract

The invention discloses a denitration catalyst for increasing a specific area and a preparation method. The method comprises the following steps: (1) mixing activated carbon with a sugar solution and pulping; (2) dissolving a titanium source precursor; (3) dissolving a tungsten source precursor and uniformly mixing the tungsten source precursor with the materials acquired in the steps (1) and (2); (4) uniformly mixing the material acquired in the step (3) and then adjusting the pH value of the solution to 8-13, precipitating, filtering and washing, thereby acquiring a filter cake; (5) adding water into the filter cake acquired in the step (4), preparing into pulp, adding a vanadium source precursor solution, mixing, drying and roasting under inert gas shielding, thereby forming powder; and (6) mixing the solution formed by a silicon source precursor with the powder acquired in the step (5) and forming slurry, adding a pore former, stirring for two times and then standing, drying and roasting under inert gas shielding, thereby acquiring the denitration catalyst. The product disclosed by the invention can increase the specific area of the catalyst and can reduce the conversion rate of SO2 / SO3.

Description

technical field [0001] The invention relates to a denitration catalyst with increased specific surface area and a preparation method thereof, in particular to a denitration catalyst resistant to uneven deposition of vanadium in flue gas and a preparation method thereof, which belongs to the technical field of new inorganic materials. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, and the emission requirements are becoming increasingly stringent. my country's "Twelfth Five-Year Plan" Comprehensive Work Plan for Energy Conservation and Emission Reduction stipulates that by 2015, the total national nitrogen oxide emissions will drop by 10% compared with 2010. In September 2011, the Ministry of Environmental Protection promulgated GB13223-2001 "Emission Standards of Air Pollutants for Thermal Power Plants", which made stricter requirements on the NOx emission concentration of thermal power plants: it stipulates that the coal-fired boile...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J35/10
CPCB01J23/002B01J23/30B01J2523/00B01J35/617B01J35/618B01J35/638B01J35/635B01J2523/47B01J2523/55B01J2523/69
Inventor 杨岳周霞巫树锋梁宝锋荣树茂贾媛媛李杨王立蓉唐中华王军
Owner PETROCHINA CO LTD
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